public class CPU extends Object{
   int speed;
   CPU() {}
   CPU(int speed) {
       this.speed = speed;
   }
   public void getSpeed(int a) {
       speed = a;
   }
   public int getSpeed() {
     return speed;
   }
   public String toString() {
     return "CPU已覆盖toString";
   }
   public boolean equals(Object obj) {
     return true;
   }
}
